Negative pole piece, preparation method of negative pole piece and lithium ion battery
A technology of negative pole piece and negative pole, applied in the field of negative pole piece and its preparation, can solve the problems of surface defects of coated pole piece, unstable coating weight gain, poor matching, etc., achieve good conduction ion path, improve comprehensive electrical Performance, uniform coating effect
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[0035] The preparation method of negative pole piece of the present invention is as follows:
[0036] Add the solvent (deionized water) into the container and start stirring; then add thickener, graphite, conductive agent in turn, and finally add the water-based slurry adhesive to obtain the bottom layer slurry (water-based negative electrode slurry); then the bottom layer slurry Spray coating or transfer coating on the current collector, then dry and roll to obtain the current collector containing the primer layer;
[0037] Add the solvent (deionized water) into the container and start stirring; then add thickener, graphite, conductive agent in sequence, and finally add the water-based slurry binder to obtain the middle layer slurry, which is added when preparing the middle layer slurry The amount of adhesive used is less than that of the water-based slurry binder added when preparing the bottom layer slurry. According to different formulations, the content of the water-based...
Embodiment 1
[0042] Negative electrode active material, conductive agent, thickener, binding agent are formulated into the bottom layer slurry according to the following mass percentage (this ratio is the ratio of dry material mass): 96.8%: 0.5%: 1.2%: 1.5%, this embodiment The negative electrode active material is artificial graphite, the conductive agent is conductive carbon black (Super-P), the thickener is sodium carboxymethyl cellulose, and the binder is modified styrene-butadiene rubber, which contains more -OH , -COOH, -SO 3H polar functional group, good adhesion with copper foil (current collector);
[0043] The pulping process is: add deionized water and CMC (sodium carboxymethyl cellulose) glue to the double planetary mixer, add ground conductive carbon black during the mixing process, and disperse for 30 minutes; after mixing evenly, reduce the stirring speed, and add artificial Stir the graphite for 3 hours to complete the dispersion process of conductive carbon black and arti...
Embodiment 2
[0055] The difference between this embodiment and Example 1 is that the bottom layer slurry is made of artificial graphite: conductive carbon black: sodium carboxymethyl cellulose: modified styrene-butadiene rubber by 96.3%: 0.5%: 1.2%: 2.0% (mass percentage ) ratio is formulated; the proportioning ratio of the middle layer slurry and the upper layer slurry remains unchanged.
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